Abstract

A STUDY TO DETERMINE THE EFFECT OF LENS POSITION PARAMETERS ON INTRA OCULAR PRESSURE REDUCTION AFTER PHACOEMULSIFICATION

Author(s): Pooja Parthasarathi1, Shashidhar S1, Ravi B1, B.L.Sujatha Rathod1

BACKGROUND
Glaucoma is one of the leading causes of blindness in the world. Many studies show that cataract surgery is a novel way of IOP reduction in glaucomatous and non-glaucomatous eyes. Several studies have been performed to understand the parameters that affect the degree of IOP reduction after phacoemulsification. There are conflicting studies regarding the importance of the lens vault Therefore, there is a need for studies on newer lens parameters as predictors for post-operative Intra ocular pressure.
OBJECTIVES
A. To analyze the effect of lens position parameters on intra ocular pressure reduction following phacoemulsification in non-glaucomatous patients.
B. To compare the results between normal angle and narrow angle eyes.
MATERIALS AND METHODS
In a tertiary Centre, 104 eyes of patients with visually significant cataract were included in the study. 4 mirror Gonioscopy was performed in all the eyes, and they were divided into two groups: Eyes with narrow angles and eyes with open angles. Preoperative Intraocular pressure was recorded for all the patients and AS-OCT was performed, and the readings noted down. All the eyes were subjected to Phacoemulsification under local anesthesia with foldable Posterior chamber intraocular lens implantation in the bag. The follow up IOP was recorded in both the groups at 1 month, 3 months and 6 months postoperative days. The results were all tabulated in M.S. Excel and then analyzed.
RESULTS of 104 patients, 56.7 % were female while 43.3 % were males. Mean IOP reduction 3 months postoperatively: In mm of Hg In open angle eyes the mean IOP reduced from IOP reduction was found to be more in eyes with narrow angles when compared to eyes with open angles. In narrow angles, The mean IOP reduction at 1 month was 3.269 mm of Hg. There was a further mean reduction of 0.808mm of Hg at the 3 month follow-up. In the open angle group the mean IOP reduction at 1 month was 2.077 mm Hg with a further reduction of 0.25 mm of Hg at 3 months. In both the groups Preoperative IOP was a significant predictor for
IOP reduction (P < 0.001). Other AS-OCT parameters like Central corneal thickness, Angle to angle distance, Anterior chamber area, Lens vault; anterior vault and relative lens vault were not found to be statistically significant predictors of IOP reduction in either of the groups.
CONCLUSION
Cataract surgery results in significant IOP reduction in both Open Angle and Narrow Angle eyes. Furthermore, we have found that preoperative IOP can be a useful predictor for IOP reduction which could be used to help potentially predict IOP response after cataract surgery.